A Trigonometric problem for JEE Aspirants

Geometry Level 4

\[ E = \tan(A) \tan(2A) + \tan(2A) \tan(4A) + \tan(4A) \tan(A) \]

Find the value of \(E\) where \(A = \dfrac{2\pi}7\).


This is Original.
Also try Range of a Three Variable Function.
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